EHEIM SubstratProOptimised bio filter medium with perfect volume usage, maximizing filter efficiency with long intervals between cleaning and top decomposition performance. SUBSTRATpro consists of pearl shaped sintered glass. The spherical shape gives a high bulk density. Thus the whole of the volume in the filter (filter baskets or modules) can be utilised. Also the optimum surface of the beads provides intensive colonisation of the important purification bacteria.
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